plan data platform migration covering scope and what is deliberately retired rather than carried, dual-run design, parity reconciliation across row counts control totals and metric values with a stated tolerance, historical backfill depth, consumer cutover sequencing, query translation risk in type
plan data platform migration covering scope and what is deliberately retired rather than carried, dual-run design, parity reconciliation across row counts control totals and metric values with a stated tolerance, historical backfill depth, consumer cutover sequencing, query translation risk in type coercion null handling timezone and rounding, freeze windows, cutover and rollback, and the decommis